Cam specs 4-2-1 vs. 4-1 headers?

77cruiser · Post by **77cruiser** » Sat Jul 08, 2017 8:40 am

What changes would you make?

Keith Morganstein · Post by **Keith Morganstein** » Sat Jul 08, 2017 10:24 am

77cruiser wrote:What changes would you make?

Unless it's known that one set of headers would be significantly better (or worse) exhaust scavenging, or perhaps tuned for a different RPM range, not much change IMO.

Paul Rig · Post by **Paul Rig** » Sat Jul 08, 2017 12:33 pm

I will have a guess
Always got to say what the intended use is..
But My guess slightly shorter cam on the exhaust side and overlap. otherwise 4-2-1s are better all rounder with less peak hp
Depends on the rev range of the engine 4-2-1's have a broader rev range but less energy (vacuum).
I play mostly with 4valve heads where the exhaust is always a shorter cam duration. where 2valve V8's are longer duration on exhaust side.
I myself like 4into1's for all out power and tune-ability for light cars and bikes.
( But I also like delortos over webbers because they atomize a finer fuel mist and are more tune-able in progression.Easier to tune too once you get your head around the secondary fuel circuits and float level tuning.)
So what would I know

~

77cruiser · Post by **77cruiser** » Sat Jul 08, 2017 12:38 pm

It's a 530hp 421 sbc in a 4200 lb. street machine. 1 or 2 trips to the track per year.

bigjoe1 · Post by **bigjoe1** » Sat Jul 08, 2017 1:55 pm

OVER THINKING !!!!!

JOE SHERMAN RACING

77cruiser · Post by **77cruiser** » Sat Jul 08, 2017 4:39 pm

bigjoe1 wrote:OVER THINKING !!!!
JOE SHERMAN RACING

Just wondering , or maybe.

BILL-C · Post by **BILL-C** » Sun Jul 09, 2017 8:19 am

The phasing of the tri-y header collectors needs to agree with the cam firing order. Otherwise no changes needed for such a mild combo.

Cubic_Cleveland · Post by **Cubic_Cleveland** » Fri Jul 14, 2017 5:10 am

77cruiser wrote:
bigjoe1 wrote:OVER THINKING !!!!
JOE SHERMAN RACING

Just wondering , or maybe.

Did you finish this set of headers?
viewtopic.php?f=1&t=41836
How did they turn out?

77cruiser · Post by **77cruiser** » Fri Jul 14, 2017 8:57 am

I got them done. I thought they turned out OK for the first set.

RevTheory · Post by **RevTheory** » Fri Jul 14, 2017 9:16 am

Wow! That's a skill set I've yet to learn. Looks great.

Cubic_Cleveland · Post by **Cubic_Cleveland** » Fri Jul 14, 2017 10:25 pm

RevTheory wrote:Wow! That's a skill set I've yet to learn. Looks great.

X2 very nice work!

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Cam specs 4-2-1 vs. 4-1 headers?

Cam specs 4-2-1 vs. 4-1 headers?

Re: Cam specs 4-2-1 vs. 4-1 headers?

Re: Cam specs 4-2-1 vs. 4-1 headers?

Re: Cam specs 4-2-1 vs. 4-1 headers?

Re: Cam specs 4-2-1 vs. 4-1 headers?

Re: Cam specs 4-2-1 vs. 4-1 headers?

Re: Cam specs 4-2-1 vs. 4-1 headers?

Re: Cam specs 4-2-1 vs. 4-1 headers?

Re: Cam specs 4-2-1 vs. 4-1 headers?

Re: Cam specs 4-2-1 vs. 4-1 headers?

Re: Cam specs 4-2-1 vs. 4-1 headers?