Speedmaster BBC heads?
Thread Starter
Burning Brakes
Joined: Apr 2002
Posts: 1,105
Likes: 114
From: Lawrenceburg, KY
Speedmaster BBC heads?
Has anyone ever looked into or had experience with the Speedmaster oval port BBC aluminum head?
I've got a junkyard Gen 6 BBC that's going into my 79 and I'd like to replace the iron heads to shed some weight. The engine has a factory compression of 9:1 and is bone stock. I'll end up throwing in some cam, but nothing crazy. Just a good "thumpy thump" for some personality.
I've got a junkyard Gen 6 BBC that's going into my 79 and I'd like to replace the iron heads to shed some weight. The engine has a factory compression of 9:1 and is bone stock. I'll end up throwing in some cam, but nothing crazy. Just a good "thumpy thump" for some personality.
Le Mans Master
Joined: May 2007
Posts: 5,047
Likes: 1,125
From: North tonawanda NY
Has anyone ever looked into or had experience with the Speedmaster oval port BBC aluminum head?
I've got a junkyard Gen 6 BBC that's going into my 79 and I'd like to replace the iron heads to shed some weight. The engine has a factory compression of 9:1 and is bone stock. I'll end up throwing in some cam, but nothing crazy. Just a good "thumpy thump" for some personality.
I've got a junkyard Gen 6 BBC that's going into my 79 and I'd like to replace the iron heads to shed some weight. The engine has a factory compression of 9:1 and is bone stock. I'll end up throwing in some cam, but nothing crazy. Just a good "thumpy thump" for some personality.
Last edited by augiedoggy; Apr 23, 2021 at 08:01 AM.
Race Director
Joined: Jul 2015
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From: SW Florida.
speedmaster is a chinese head. chinese castings used to be junk. they have gotten better. chinese VALVES are not to be trusted. buy bare castings and put manley or ferrea valves in with compcams or better springs, locks, etc. i almost bought a blown 496. guy paid 5k for complete engine. pro comp heads, an intake valve head popped off in his driveway at idle. he got 500 for his 5k engine. that L29 is a nice block. flat pistons, 4 bolt, roller lifters. here is best cam that will run on those dogbone lifters. used to be 200 bucks... https://paceperformance.com/i-625508...zz502-502.html
Last edited by derekderek; Apr 23, 2021 at 01:13 PM.
Thread Starter
Burning Brakes
Joined: Apr 2002
Posts: 1,105
Likes: 114
From: Lawrenceburg, KY
Last edited by ChrisLSx; Apr 23, 2021 at 02:54 PM.
Drifting
Joined: Aug 2019
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I was looking at ProMaxx last night. They have a MAXX 290 head which looks like an oval port (but they don't state specifically). They look to be a knockoff of the Trickflow 290 head.
Last edited by Eric P; Apr 23, 2021 at 02:51 PM.
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Thread Starter
Burning Brakes
Joined: Apr 2002
Posts: 1,105
Likes: 114
From: Lawrenceburg, KY
Drifting
Joined: Aug 2019
Posts: 1,515
Likes: 499
Trickflow has a .300 raised exhaust if that messes with anything and Trickflow is also out of stock for a month or two
Promaxx 290 will flow 375 cfm with 2.19 intake, 400 cfm with 2.30 intake, that’s some serious flow from a 290cc port
Promaxx 290 will flow 375 cfm with 2.19 intake, 400 cfm with 2.30 intake, that’s some serious flow from a 290cc port
Last edited by Eric P; Apr 23, 2021 at 08:50 PM.
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Not an exact answer...but I bought a set of Speedmaster heads for a 408" Ford Clevor project I'm building. (That's a Windsor block with Cleveland heads- think Boss 302...just bigger). I got them when they had a huge sale on Black Friday.
I was impressed with the castings. These weigh 35 lbs (very comparable to high end heads). The holes are all helicoiled and when I put the intake on them the angles look fine. I didn't get the CNC versions, so there's a little cleanup in the ports needed...but I was planning to port on them anyway.
I was impressed with the castings. These weigh 35 lbs (very comparable to high end heads). The holes are all helicoiled and when I put the intake on them the angles look fine. I didn't get the CNC versions, so there's a little cleanup in the ports needed...but I was planning to port on them anyway.
Last edited by 427Hotrod; Apr 24, 2021 at 12:26 AM.