[DeTomaso] Cleveland heads - Edelbrock 61629

Daniel C Jones daniel.c.jones2 at gmail.com
Tue Feb 23 12:27:31 EST 2010


> I was just reading an article that a friend sent me on an article that
> came out in April of 2009 on Edelbrock Cleveland head. Has anyone had any
> experience with them? They get a good review on the article.and with the
> right cam the motor made almost 450 horse.

Understand that magazine articles are generally written to support the
magazine's advertisers, not determine which parts are best for you.
I've not tested the Edelbrock 351C-2V heads but based upon Edelbrock's
published flow data, they flow the least of the aftermarket 2V heads
(CHI, TFS and AFD all make aluminum 2V heads).  Also, the 2V heads flow
the least of the Cleveland port configurations (2V, 3V, 4V, A3, B351,
C302).  The flow numbers in the article you reference are:

Edelbrock 351C-2V
2.05" intake, 1.65" exhaust

Lift	Intake	Exhaust (CFM)
.100	70.2	48.7
.200	139.1	92.9
.300	204.8	123.0
.400	242.5	145.4
.500	267.9	160.8
.600	271.6	170.5

As a point of comparison, a set of ported iron 4V heads we had on the flow
bench flowed 322 CFM at 0.6" lift.  That said, it's the combination that
makes the power.  When we bolted an unported Blue Thunder or Ford dual plane
intake manifold to the heads, the flow dropped a bunch with half the runners
dropping to the 250 CFM range.  Porting the intake to equalize the flow
brought the runners up into the 280 CFM range.  A good single plane intake
will flow nearly what the bare heads flow.  As a combination, it's entirely
possible that a set of Edelbrock 351C-2V heads with RPM Air Gap will make
as good or better power than heads flowing more that are coupled with an
inferior intake manifold.  The exhaust side is, if anything, even more
important.  We've seen a 50 HP difference between the Pantera ANSA mufflers
and a good flowing muffler like the Magnaflows.

If I were looking for 2V heads, I'd probably look at the TFS heads.
They have a larger intake valve and slightly raised exhaust port and,
if the TFS furnished numbers are to be believed, they should outflow
the Edlbrock heads.

TFS aluminum 351C heads
 2V-based ports with exhaust raised 0.1"
 190cc "as cast" finish intake port volume.
 2.08"/1.60" valves.
 62cc CNC profiled heart shaped combustion chamber.
 some domed pistons may not clear combustion chamber
 Has enough material to port match to a 4bbl port.
 revised oil drainbacks
 provisions for Windsor blocks
 Stock valve locations/angles

 1.460" dual spring (120lbs seat / 390lbs open) 0.650" max lift
 1.530" dual spring (138lbs seat / 430lbs open) 0.680" max lift
 Additional spring options to follow.

Flow "as cast" with minor clean up

190cc 2.08/1.6
Intake
.1 - 68
.2 - 140
.3 - 202
.4 - 248
.5 - 286
.6 - 299

Exhaust
.1 - 55
.2 - 111
.3 - 151
.4 - 187
.5 - 217
.6 - 232

Dan Jones



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