HOME MAGAZINE FORUM RULES SPONSORS CONTACT
     
   
   
 
Go Back   CLASS RACER FORUM > Class Racer Forums > .90 Heads Up Class Racing Tech

Reply
 
Thread Tools Display Modes
Old 10-04-2018, 07:55 PM   #1
gnicholson
Junior Member
 
Join Date: Sep 2011
Posts: 75
Likes: 0
Liked 3 Times in 2 Posts
Default new super street engine

Seeing how there isn't a lot of traffic on this site in this category anymore I figured I would ask a question get some opinions. I'm thinking about building a new engine for my 70 Chevelle super street car. Right now it has a 505 inch stock block big block Chevy that made about 860 horsepower on the dyno. So it's middle-of-the-pack horsepower wise. On a decent day it'll run 138 miles an hour or so on the stop. Because I would rather not fabricate new headers and change the combination a bunch by adding a ton of horsepower I was thinking a better option might be to build a 4.625 by 4 inch 532. It would have a little better piston speed than a 4 250 Stroke motor plus it would work with my 2.125 headers. I'm thinking maybe 50 or 75 more horsepower. Enough to give me a little more top speed without having to completely redo the combination as everything works pretty well right now. What do you guys think? Would you go something like this or just go ahead and build a 1200 horse 583 or something and start over basically?
gnicholson is offline   Reply With Quote
Old 10-05-2018, 08:08 AM   #2
Keith 944
VIP Member
 
Keith 944's Avatar
 
Join Date: Feb 2006
Location: Dela-where?
Posts: 1,144
Likes: 54
Liked 51 Times in 30 Posts
Default Re: new super street engine

Personally I like the idea of keeping a small bore big stroke, if anything happened you still have room to bore.
middle of the pack is not a bad place to be. if you get going too fast it becomes hard to judge the very slow.
one other issue with going big inch is everything else in your driveline has to be bulletproof
__________________
KEITH MAYERS
2 X somebody
many X nobody
Keith 944 is offline   Reply With Quote
Old 10-05-2018, 08:37 AM   #3
jmcarter
VIP Member
 
jmcarter's Avatar
 
Join Date: Dec 2008
Location: Richmond Hill GA (and Port Ludlow WA)
Posts: 2,768
Likes: 140
Liked 334 Times in 104 Posts
Default Re: new super street engine

Assume you’ve got a fairly heavy car (my Super Street Avenger was right at minimum and only had 600 and could run 137); lightening the car yields the same results and helps with reliability and can possibly make it react faster, depending on your setup of course.
__________________
Jim Carter
2340 Super Stock
2340 SST/2340 Stock
jmcarter is online now   Reply With Quote
Old 10-05-2018, 09:48 AM   #4
Lenny5160
Member
 
Lenny5160's Avatar
 
Join Date: Nov 2015
Location: Inver Grove Heights, MN
Posts: 460
Likes: 57
Liked 42 Times in 30 Posts
Default Re: new super street engine

I wouldn't let the headers dictate your plans. I'm a big fan of small headers; they won't blow up the dyno sheet but always seem to ET well relative to the measured power.

The 632 in my dragster only has 2.25" headers and is an underachiever at 1020 HP, but all the other guys going 8.90 at 180+ seem to need 1200+ HP to do it and I'm in that club.

I'd probably go with the longer stroke; more torque to get that car moving off the stop. And the smallish headers will help with velocity at lower RPM. Same with a smallish carb.
__________________
Tony Leonard
S/ST 5160
S/C 5160
Lenny5160 is online now   Reply With Quote
Old 10-05-2018, 01:46 PM   #5
gnicholson
Junior Member
 
Join Date: Sep 2011
Posts: 75
Likes: 0
Liked 3 Times in 2 Posts
Default Re: new super street engine

the car is 3150 with me. it also sets a bit high and has the aerodynamics of a similar sized brick. i plan on lowering the front a bit this winter. wanted to let the new springs take a set before cutting them. I thought it would be faster than it is to but I'm sure it's the car and not the engine. It has a 488 rear right now and is going through the traps at about 7400 RPM. I've tried a couple of different converters. Right now I have a very consistent car in the 60 and im extremely happy with how the car drives. i can fab another set of headers if i need to just trying to keep it simple. i definitively agree with staying on the small side with pri tubes.
i talked to you this last weekend in great bend tony. i have the dark red 70 chevelle. thats an awesome nova you have.
gnicholson is offline   Reply With Quote
Old 10-05-2018, 02:45 PM   #6
Lenny5160
Member
 
Lenny5160's Avatar
 
Join Date: Nov 2015
Location: Inver Grove Heights, MN
Posts: 460
Likes: 57
Liked 42 Times in 30 Posts
Default Re: new super street engine

Quote:
Originally Posted by gnicholson View Post
i talked to you this last weekend in great bend tony. i have the dark red 70 chevelle. thats an awesome nova you have.
I knew you had some posts on the forum at the time we spoke! Great to actually meet you, and that Chevelle is extremely nice! I've never seen a car that said "Wagner's" on the door that wasn't mint.
__________________
Tony Leonard
S/ST 5160
S/C 5160
Lenny5160 is online now   Reply With Quote
Old 10-05-2018, 05:12 PM   #7
Average Joe
Junior Member
 
Join Date: Jan 2007
Posts: 12
Likes: 0
Liked 0 Times in 0 Posts
Default Re: new super street engine

Go big or go home.
Average Joe is offline   Reply With Quote
Old 10-05-2018, 06:01 PM   #8
X-TECH MAN
VIP Member
 
Join Date: Dec 2007
Location: Lake Placid, Florida
Posts: 3,073
Likes: 430
Liked 69 Times in 33 Posts
Cool Re: new super street engine

I did not know MPH won races in the .90 classes ?
X-TECH MAN is offline   Reply With Quote
Liked
Old 10-06-2018, 08:02 AM   #9
X-TECH MAN
VIP Member
 
Join Date: Dec 2007
Location: Lake Placid, Florida
Posts: 3,073
Likes: 430
Liked 69 Times in 33 Posts
Talking Re: new super street engine

quote deleted .........

Last edited by X-TECH MAN; 10-07-2018 at 12:33 PM.
X-TECH MAN is offline   Reply With Quote
Old 10-08-2018, 08:15 AM   #10
Tom Goldman
VIP Member
 
Tom Goldman's Avatar
 
Join Date: Jan 2003
Location: Allentown,PA
Posts: 2,147
Likes: 88
Liked 29 Times in 14 Posts
Default Re: new super street engine

There is a huge benefit in air flow with the larger bore size although I would go to 4.600" ,the additional .025" would be insignificant .
I would go with the 4.250 stroke and a .400 long rod. ….This has proven to be a good combination for making power thru a very wide RPM band .
On a car as heavy as yours , you will benefit from the 2 1/8" headers even with the larger displacement.
Just don't over cam it with too much duration .
__________________
Tom Goldman 1500 SG , 1506 STK
Tom Goldman is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 02:55 PM.


Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Copyright © Class Racer.com. All Rights Reserved. Designated trademarks and brands are the property of their respective owners.Ad Management plugin by RedTyger