75 Nova U/SA

[joe huestis]

The combination in this car is the 262/165 which in '75 had to use the tiny 1.09" Venturi 2GC carb. This puts a major challenge with this combo. This is the exact motor I ran in my Monza stocker sans the small carb. As a '76 I was able to run the 1.18 venturi carb such as what Briane Philbrick runs on his in Canada. That .09" difference makes a world of difference in the performance of this tiny V8.

[goinbroke2]

Thanks Joe, for comparison though, a 302 runs 1.08 and a 351 or 400 ford runs a 1.21....so in relative terms, he ain't so bad! LOL!

Cool stocker though.

[Billy Nees]

Originally Posted by goinbroke2

Thanks Joe, for comparison though, a 302 runs 1.08 and a 351 or 400 ford runs a 1.21....so in relative terms, he ain't so bad! LOL!

Cool stocker though.

The air horn on the 2Gs is very small and restrictive not like the motorcraft 2Vs. Big difference.

[Dwight Southerland]

Does anyone have REAL flow numbers for 2-bbl carbs?

[goinbroke2]

This is for the Fords;

Ford 2barrel CFM by venturi size --
.98=190
1.01=240
1.02=245
1.08=287
1.14=300
1.21=351
1.23=356
1.33=424

As most already know 4bbls are rated at 1.5" vacuum and 2bbl's are rated with 3" vacuum. I'd be curious to see what the chev 2bbl's flow.
Oh, and this is untouched flow numbers.

[Dwight Southerland]

Originally Posted by goinbroke2

This is for the Fords;

Ford 2barrel CFM by venturi size --
.98=190
1.01=240
1.02=245
1.08=287
1.14=300
1.21=351
1.23=356
1.33=424

As most already know 4bbls are rated at 1.5" vacuum and 2bbl's are rated with 3" vacuum. I'd be curious to see what the chev 2bbl's flow.
Oh, and this is untouched flow numbers.

I have seen this list before. Do you know where it came from and some justification for its accuracy? Are these numbers @3"H2O?

[Mark Yacavone]

Originally Posted by joe huestis

The combination in this car is the 262/165 which in '75 had to use the tiny 1.09" Venturi 2GC carb. This puts a major challenge with this combo. This is the exact motor I ran in my Monza stocker sans the small carb. As a '76 I was able to run the 1.18 venturi carb such as what Briane Philbrick runs on his in Canada. That .09" difference makes a world of difference in the performance of this tiny V8.

True enough.It's a small carb.Same one Billy uses on his 307.
It feeds 45 less cubes though.
Less cam, but a bit more compression.
30 hp less , rating wise
It ought to run a half second under in decent air with headers, converter and such things maxed out......in my opinion.

[MikeMoller]

Sooooo the new alternator setup worked well, but hard to tell if there was a performance pickup. Ran an 1/8 mile CCRA race and the air was really bad, 90+ degrees and very humid, first really bad air I have run in. One P/SA car that normally runs mid/low 8.0's in reasonable air was running high 8.2's, and I was at 9.56 twice. Took 2 degrees timing out and went slower. So I'm guessing based on the P/SA car I was losing at least .2 which would have put me at 9.36 in reasonable air(9.50 IHRA 1/8). No races coming up and weather is HOT so going to concentrate on header and converter mods for the time being.

Mark, the current headers are Hooker Headers#520-2451(several pics on JEGS) 1 5/8 prim 30" long 3" collector with 18 inches added. I don't think these are totally 'equal length' either. Test was to see if the merge stuff worked on the 'old' headers before I hacked up the hookers. So not going to hack them based on the test. And yes I am going to call Kenny.

[Dwight Southerland]

Originally Posted by Mark Yacavone

True enough.It's a small carb.Same one Billy uses on his 307.
It feeds 45 less cubes though.
Less cam, but a bit more compression.
30 hp less , rating wise
It ought to run a half second under in decent air with headers, converter and such things maxed out......in my opinion.

????


Billy's 307 uses a 1.437" throttle bore carb like a 283; the 75 262 uses a 1.686" throttle bore carb like a 305/350. The 72 307 is rated at 171; the 75 262 is rated at 165.

[Mark Yacavone]

Originally Posted by Dwight Southerland

????


Billy's 307 uses a 1.437" throttle bore carb like a 283; the 75 262 uses a 1.686" throttle bore carb like a 305/350. The 72 307 is rated at 171; the 75 262 is rated at 165.

I should have said same venturi size, which is smallest restriction, and what most look at for air flow comparision...FFFFFord air horns aside for a moment.

My mistake.I though Billy had a 1970 year model. Never looked at it too closely.
Should have looked it up on www.classracerinfo.com

I stand by whatever's left!