Original 327 going back in my 64 Corvette with mods

[Little Mouse]

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Can you do the porting work yourself if not what cost for porting. So you port the heads for better high lift flow but are not the twisted wedge heads limited to lift with a 23 degree piston notch. You wont be limited with the new head.

I think about 600 for the port work by a respected pro. Aren't the new TF Vintage head also 23 degree. My Brodix -8 23 degree heads make 582 HP at 8000 on our 327 12.4 to 1 dry sump road race motor in our 1968 Tube frame IMSA AAGT type road race Corvette.

In the past as owner of 4 corvettes 1 C2, 66 and 3 C3s. Dang you with this picture your making me drool all over myself.

[bosco]

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Can you do the porting work yourself if not what cost for porting. So you port the heads for better high lift flow but are not the twisted wedge heads limited to lift with a 23 degree piston notch. You wont be limited with the new head.

I think about 600 for the port work by a respected pro. Aren't the new TF Vintage head also 23 degree. My Brodix -8 23 degree heads make 582 HP at 8000 on our 327 12.4 to 1 dry sump road race motor in our 1968 Tube frame IMSA AAGT type road race Corvette.

In the past as owner of 4 corvettes 1 C2, 66 and 3 C3s. Dang you with this picture your making me drool all over myself.

We won the SCCA SE Div SARRC championship race in GT-1 and overall at Daytona in Sept. 1:54 lap in 90 degree heat on used rubber. Proud of what we have accomplished with that car. Gives lots of modern stuff FITS.

[Ericnova]

I loved the way it revved back in the day versus the big block grunt of the 383 stroker

His car, his money, his decision. We're all entitled to our own opinions, but not to our own facts. How many agree that a 400hp street 327" will pull to revs quicker/faster than an equally well-built 383'?

Put me on that list....383 wins every time.... if you've got a 383 that revs slow, you didn't build it right.

More torque moves any given weight faster...in the same car with the same gearing the 383 will rev faster than the 327 will.

"The older I get, the faster the engines used to be" or any variation of this syndrome is strong around the hot rod hobby.

[DCal]

I don't have the numbers in front of me but I know that between the TFS Twisted and any normal 23 degree SBC head there are substantial differences in valve locations. So be sure to check for PTV clearance.

[rfoll]

I have a set of 1.6/1.5 Trick Flow rockers that came from Twisted Wedge heads if you find the need. I'm not in love with them, and the motor they are on is scheduled for disassembly.

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[Little Mouse]

I loved the way it revved back in the day versus the big block grunt of the 383 stroker

His car, his money, his decision. We're all entitled to our own opinions, but not to our own facts. How many agree that a 400hp street 327" will pull to revs quicker/faster than an equally well-built 383'?

Put me on that list....383 wins every time.... if you've got a 383 that revs slow, you didn't build it right.

More torque moves any given weight faster...in the same car with the same gearing the 383 will rev faster than the 327 will.

"The older I get, the faster the engines used to be" or any variation of this syndrome is strong around the hot rod hobby.

You said it if your stuck with bad gearing 383 would be great. But then if you have the gearing to work with tq it will give you. Then the story changes. When they ran weight to cubic inches they could build bigger Sb then they ever did. Theres a reason for that. In fact you saw a lot of 292 stuff out there non of those over stroked monster 350 cu. Chevies. Lol

[Schurkey]

What version 1rst or 2nd in the trick flow twisted heads ?

That is a good question...they were purchased new in 2001.

These are not the only differences, but this is the easiest way to identify which generation you have.
Gen 1 Twisted Wedge heads have 13 degree intakes, 23 degree exhaust, and RAISED GUIDE PLATES.

Gen 2 Twisted Wedge heads have 16 degree intakes, 18 degree exhaust, and FLAT GUIDE PLATES.

In both cases, heads used with self-aligning rockers may not have shipped with guideplates.

The Gen 1 Twisted Wedge heads should be used with Comp Cams "special" intake rocker arms. The exhaust rocker arms are standard design. Comp has four part numbers for intake rocker arms, to cover 3/8 and 7/16 studs, 1.5 and 1.6 ratio.

Gen 1 instruction sheet:
http://hbassociates.us/Twisted_Wedge_G1 ... ctions.pdf

[bosco]

What version 1rst or 2nd in the trick flow twisted heads ?

That is a good question...they were purchased new in 2001.

These are not the only differences, but this is the easiest way to identify which generation you have.
Gen 1 Twisted Wedge heads have 13 degree intakes, 23 degree exhaust, and RAISED GUIDE PLATES.

Gen 2 Twisted Wedge heads have 16 degree intakes, 18 degree exhaust, and FLAT GUIDE PLATES.

In both cases, heads used with self-aligning rockers may not have shipped with guideplates.

The Gen 1 Twisted Wedge heads should be used with Comp Cams "special" intake rocker arms. The exhaust rocker arms are standard design. Comp has four part numbers for intake rocker arms, to cover 3/8 and 7/16 studs, 1.5 and 1.6 ratio.

Gen 1 instruction sheet:
http://hbassociates.us/Twisted_Wedge_G1 ... ctions.pdf

Good info, the TF's are on the 383 right now.

[bobmc]

why do the heads need porting? they should be more than capable out of the box

[bosco]

why do the heads need porting? they should be more than capable out of the box

After talking with a TF tech who stated that they certainly can be improved. My goal is 400 HP, I think it might take that step to hit it at about 10.5 compression and not too wild of a cam.

[cv67]

the comp 280 will behave just fine, used to daily a 327 with the Isky version (108 lsa) manners were fine.

[bosco]

the comp 280 will behave just fine, used to daily a 327 with the Isky version (108 lsa) manners were fine.

Thanks for that. I think the comp version is on a 112, so might idle a tad smoother.

[rfoll]

The Comp 280H, (12-121-2), has a 110 lsa. The L79 is ground on 114. This isn't a small upgrade.

[n2omike]

the comp 280 will behave just fine, used to daily a 327 with the Isky version (108 lsa) manners were fine.

Thanks for that. I think the comp version is on a 112, so might idle a tad smoother.

All of the Isky Mega Cams have a 108 LSA
All of the Comp Magnum cams have a 110 LSA

I don't think you mentioned what transmission (manual vs. auto) the car has, or gear ratio. If it is an automatic, what converter is in it?

I've built a lot of similar sized engines, and I think a good 'out of the box' cam for your combo would be the Isky 270 Mega Cam. It would sound good, yet still have plenty of low/midrange, and also pull hard to 6000 rpm.

The 280 Magnum will be kind of soft until the engine reaches 3500 rpm. A little too much for a dual plane intake, etc on a street engine with only 327ci.

General rule of choosing a cam... Look at what your eyes 'want', then back up a step.

Good Luck

[Little Mouse]

Not with me I like the bottom of the page cams, then if I had any sense step back several steps. Lol