Gen 4 heads on a Gen 5 block
 

I know this has been kicked around a little before, but can someone show some pics of both a gen 4 head surface and a gev 5 block surface, and where the potential leak areas are? Someone out there has to have some spare parts to take some pics of.

Re: Gen 4 heads on a Gen 5 block
 

Dennis Moore's BBC Marine Hi-Perf. book covers that all nicely with pics. Coolant leaks into the lifter valley. --- Jer

Re: Gen 4 heads on a Gen 5 block
 

Thanks, talked to TEAQUE today, and they first said sure with the right gaskets. But he went out back and talked to the mechanics and they said no way, it will definately not work. Now I have to change the whole motor..............

Re: Gen 4 heads on a Gen 5 block
 

gen 4 heads can be installed on a gen 5 or 6 block , use felpro# 1037 for 4.250 bore & 1047 for 4.500

Re: Gen 4 heads on a Gen 5 block
 

You know this question is coming, have you used these successfully? It would sure make things easier for me.

Re: Gen 4 heads on a Gen 5 block
 

SPANKER i wouldn't pull your tale on something like this ! if you need more info. email me and i will give you my phone ## :cool:

Re: Gen 4 heads on a Gen 5 block
 

I had a situation where I was going the other way around... I.E. Gen VI heads on a Mark IV block. I called the tech support at both Fel Pro ( Federal Mogul ) and Cometic... Cometic spent a great deal of time with me ( they were great ) in the end, they did not have a gasket recommendation... Fel Pro did recommend the 1037 / 1047 ( depending on std. bore vs overbore ) and stated that they have had good results either way, I.E. mark IV 's on gen 5 and 6 and vice versa. I upgraded my Mark IV ( 454 / 365 hp magnums ) to be identical to the HP-500...and topped it off with Gen VI heads. I had water problems in the oil. Blamed the heads at 1st. It turned out to be reversion. I pressure checked the head/block cooling system and the pressure was fine. All of that said, I am switching back to Mark IV
heads... My Gen VI heads ( rectangular port ) are going to be up for sale this spring.

Re: Gen 4 heads on a Gen 5 block
 

Yes, with the right head gaskets you can put Gen IV heads on a Gen V or VI block. Wrong head gaskets you will have cooling problems. I know I did till I got the right head gaskets. I also had problems finding the right push rods.

Re: Gen 4 heads on a Gen 5 block
 

Head gaskets to put Gen IV heads on a Gen V or VI block. Fel-Pro Marine, Gasket# 17048

Re: Gen 4 heads on a Gen 5 block
 

The 17048 is not listed for a 454 bore its for a 502 bore. But it still is not listed for a gen 4 head swap. But the 1037 does look like the right one. It's listed for all years.

Re: Gen 4 heads on a Gen 5 block
 

I don't think the 1037, or 1047 are stainless . I think they are automotive. I know the 17048 is marine, and is for a 4.5 bore. You will loose apx 4-6 cc's if put on a 454 . I think the gasket you need is a Felpro 17046 but check first. Summit sells them.
Actually looking through the Felpro marine catalog, I noticed all Felpro Marine gaskets are 17000 series, whether it be a Ford , Chevy, Chrysler, 4,6,or 8 Cyl. Did you check if there is a Cometic gasket for this application ? What are you trying to do ? Are you trying to go to large oval heads or rectangle, from peanut port ? BBB

Re: Gen 4 heads on a Gen 5 block
 

HOW 'BOUT BADKACHINA'S GEN 5 RECT HEADS. lOOK UNDER NEED HEADS. THEN U NEED NOT WORRY ABOUT DIFFERENCES IN GASKETS. ... bbb

Re: Gen 4 heads on a Gen 5 block
 

Fel-Pro 17048 is for the 502 and 17046 is for the 454. Gaskets needed to swap Gen IV heads to a Gen V or VI block. The coolant holes are blocked on these gaskets to re-direct the water flow to the exhaust side of the heads. If you use the stock Gen IV or Gen V heads gaskets on a Gen V block with Gen IV heads you will over heat the motor. "Been there done that". Gen IV heads have water passage ways on the front and rear of the heads where Gen V & VI heads do not. Fel-Pro made these gaskets special for this reason. So people like us can do stuff like this.

Re: Gen 4 heads on a Gen 5 block
 

Monkey,
Since I work in the marine business, building engines, and this is a common question, I am going to post my phone number, as others will probably view this thread in the future.


Gary Hill
Eastern Hills Marine
513-561-4849

17048 Gasket is the same as the 1047 the difference is marine packaging.