My 88 Olds wagone U/SA 10 Pennies

[SSDiv6]

Originally Posted by Bob Mulry

I didn't see a spec for lifter diameter in the NHRA Technical Bulletin for a 1988 Oldsmobile with a 307ci engine, but classracerinfo.com said .842 lifter?????

On line it looks like only the early Oldsmobile's take the .921 lifters????

Have you measured the lifter bores in your 307 block????

I am just confused

Bob,

1966-1967 400 and 425 Olds engines use a .921 Dia conventional hydraulic lifter.

However, the 1985-1988 Olds 307 with peanut ports, rated at 138 HP, and the 1981-1985 Olds 350DX diesel engine use a .921 hydraulic roller lifter.

[Mark Yacavone]

Originally Posted by SSDiv6

Mark,

Like I shared with Jeff, be careful with the washers.

Commercial washers, even the high strength ones, are usually Chinesium and will deform.

Talking from actual experience with some lifters I shimmed with high grade hardened washers and they squeezed to a thinner dimension.

Ended buying some 7075-T6 Aluminum round stock and cut it to the proper length.

I will plead guilty of not using much RPM and valve spring pressure on our latest combo.
So, when in doubt, leave it to the engineer.

[SSDiv6]

Originally Posted by mark yacavone

i will plead guilty of not using much rpm and valve spring pressure on our latest combo.
So, when in doubt, leave it to the engineer.

lol!

[Jeff Stout]

Here is rear end set up I hope for the last time. I think pattern is good as it took around 6 adjustments to get this pattern. Scored a set of used complete wild wood brakes. $215 shipped. The rotors were shot but I have a new set in the drawer that are drilled and were spares from old car I sold. Also the caliper mounts have a large hole for big Ford bearing that I will need to address. Total $6862.98

[Bunkster]

Originally Posted by Jeff Stout

Here is rear end set up I hope for the last time. I think pattern is good as it took around 6 adjustments to get this pattern. Scored a set of used complete wild wood brakes. $215 shipped. The rotors were shot but I have a new set in the drawer that are drilled and were spares from old car I sold. Also the caliper mounts have a large hole for big Ford bearing that I will need to address. Total $6862.98

Ratio?

[Jeff Stout]

Originally Posted by Bunkster

Ratio?

6.14. with biggest 30x9 I could find. I've been told I should go the other way. 5 something ratio with a 27,28 tall tire but this is what I found for now

[GTOMayhem]

Originally Posted by Jeff Stout

6.14. with biggest 30x9 I could find. I've been told I should go the other way. 5 something ratio with a 27,28 tall tire but this is what I found for now

OK, stupid question time. What are the advantages/disadvantages to larger vs smaller tires with corresponding ratio changes? Is it because of the low HP engine? Big car?

Rick Thomason
GTOMayhem

[Jeff Stout]

Originally Posted by GTOMayhem

OK, stupid question time. What are the advantages/disadvantages to larger vs smaller tires with corresponding ratio changes? Is it because of the low HP engine? Big car?

Rick Thomason
GTOMayhem

Some have been saying that I don't need to drag a big tire all the way done the track when I'm a low HP car.

[nickh]

Jeff are you looking at the lightweight radial or is that bad for such a heavy car?

[Jerry Terry]

They are probably right Jeff, when i raced the1968 BelAir wagon it was hard pulling those tires but actually we started airing them up a little at a time and we would go faster and it still hooked okay it also depended on the track but it hooked almost everywhere.
Jerry