327 300 1965 stocker

[HP HUNTER]

Originally Posted by Mark Yacavone

Needs about 410 to run a second under in I/SA.

Ok

So we know a 294 CUIN 283 4 jet can make 373 STP HP. 1.27 HP per inch.

Now looking at the 300 HP 327 combination @ 340 CUIN. Bigger bore, more compression, 1.940 intake valve, more cross section in the intake port.
It makes sense to me this engine should be able to make 1.27 HP per inch if not more. 1.27 X 340 = 432 HP. NHRA 365 HP 327 makes 470 HP.

[Mark Yacavone]

Originally Posted by HP HUNTER

Ok

So we know a 294 CUIN 283 4 jet can make 380 STP HP. 1.292 HP per inch.

Now looking at the 300 HP 327 combination @ 340 CUIN. Bigger bore, more compression, 1.940 intake valve, more cross section in the intake port.
It makes sense to me this engine should be able to make 1.292 HP per inch if not more. 1.292 X 340 = 439.2 HP. NHRA 365 HP 327 makes 470 HP.

Sounds good..if you compare it to the best 283 that ever was.
327 /365 has too much difference to base a comparison off of .
http://www.classracerinfo.com/Engine...MAKE=Chevrolet

I don't know how far under you want to go , Jim, but I'm standing by my observation, using my formula that has been pretty accurate over the years.

[Frank Castros]

Mark,
Please speak more about your formula.

[Jim Hanig]

Originally Posted by Mark Yacavone

Sounds good..if you compare it to the best 283 that ever was.
327 /365 has too much difference to base a comparison off of .
http://www.classracerinfo.com/Engine...MAKE=Chevrolet

I don't know how far under you want to go , Jim, but I'm standing by my observation, using my formula that has been pretty accurate over the years.

Mark we would like too run .050 under in race mode . 6/7 under in go faster.the 327 275 i worker on struggled to make 400. this was with old school, but have not ran a AFB carb. so not sure .

[Mark Yacavone]

Originally Posted by Jim Hanig

Mark we would like too run .050 under in race mode . 6/7 under in go faster.the 327 275 i worker on struggled to make 400. this was with old school, but have not ran a AFB carb. so not sure .

Jim, the trick is getting a cam into those things and max compression. My one and only attempt didn't do so well.
Anyway , the AFB deal should fall between the 4 GC and the Q-jet. We know that much .
Other than that, I'd have to look at one closely, with the newer rules, and I just haven't.
As mentioned , Jim Lewis would know the deal on them. I don't bother people at work, that do this stuff for a living, though. I haven't seen the ol' boy at the races in a while.

[Alan Nyhus]

Jim, we know what good 327-275's make so what we're looking at is....

-the difference between a good AFB and a good QJet
-what (if any) difference there is in the cam (.399/.399 on the 300 & .390/.410 on the 275)
-what (if any) difference there is in a good AFB intake compared to a good Qjet intake

The 327/300 @ 265 isn't horrible. But the 327/250 is the same engine (except for the 4G) and intake and it's @ 245. I don't see the AFB covering the 20 hp difference, even with the intake being a bit better on the AFB.....given the current state of Stocker intake technology.

But .60-.70 under should be no problem for a decent 327/300, though. -Al

[Mark Yacavone]

Originally Posted by Alan Nyhus

Jim, we know what good 327-275's make so what we're looking at is....

-the difference between a good AFB and a good QJet
-what (if any) difference there is in the cam (.399/.399 on the 300 & .390/.410 on the 275)
-what (if any) difference there is in a good AFB intake compared to a good Qjet intake

The 327/300 @ 265 isn't horrible. But the 327/250 is the same engine (except for the 4G) and intake and it's @ 245. I don't see the AFB covering the 20 hp difference, even with the intake being a bit better on the AFB.....given the current state of Stocker intake technology.

But .60-.70 under should be no problem for a decent 327/300, though. -Al

Al, it's 260 in a Chevelle with iron heads ..That's 60 pounds lighter in !/SA..Something anyway.

[Alan Nyhus]

Originally Posted by Mark Yacavone

Al, it's 260 in a Chevelle with iron heads ..That's 60 pounds lighter in !/SA..Something anyway.

Yes...not sure what body style Jim is referencing, though. The valve notches are the struggle, for sure. -Al

[MR DERBY CITY]

Originally Posted by HP HUNTER

Ok

So we know a 294 CUIN 283 4 jet can make 380 STP HP. 1.292 HP per inch.

Now looking at the 300 HP 327 combination @ 340 CUIN. Bigger bore, more compression, 1.940 intake valve, more cross section in the intake port.
It makes sense to me this engine should be able to make 1.292 HP per inch if not more. 1.292 X 340 = 439.2 HP. NHRA 365 HP 327 makes 470 HP.

Wow ! Wonder how much the 283 would make with the correct intake manifold and not the BOGUS one ?? I need one of these FRIENDLY Dynos so I can feel better about my lil 305..... CHEERS. .....!!!!!!

[GTX JOHN]

10 - 15 years ago = 1.5 x factored HP in Stock
AND.....................= 2.0 x factored HP in SS

NOW DAYS: Better figure at least 10 or 15 % Higher.
To be competitive is getting tougher AND more expensive
every darn year!

If all you want is 6 or 7 under in full race mode = 375 would probably do it with that combo

If the two fast I/SA last week at Winters had meet in later rounds = It would have
taken at the very least 1.15 to 1.20 to be even be competitive. (I know the cars and
my boy owns one of them)