Speedmaster vs trick flow

[Illahe]

I go 10.20s with a tuned up set of Speedmasters.

Care to share the specs on your combination?

 

[69conv]

Between the different valve pockets and shorter CH of the 405 pistons, it’s about a 10cc difference in the compression calculation…….. which in that combo will likely work out to about 1 point of compression.

So do you mean 9.5 to 9.6 or 9.5 to 10.5?

 

[PRH]

9.5 to 10.5

Just find an on line compression calculator and start crunching numbers to see where you’re at.

 

[RIBOATSERVICES]

I ran the Speedmasters with 405cp's and the camshaft attached with good results.

A pair of Promaxx 171 cc heads, less valve springs, are 1202.75 right now plus shipping:

Maxx 171 SB Mopar (Sold in Pairs) - PROMAXX Performance Products

Pull the R.V. cam out and put a SFT in there. This cam works extremely well with a low compression street effort:

Mechanical Flat Tappet Camshaft; 1964 - 2003 Chrysler 273, 340, 360 2400 to 6200 Howards Cams 710862-08 | Howards Cams

Are the SM heads oil thru heads or pushrod ?

 

[Illahe]

Are the SM heads oil thru heads or pushrod ?

Yes. They oil through the head bolt bore to the rocker shaft like an OEM cylnder head.

 

[PRH]

I ran some numbers for an uncut block and a .040 gasket……..

It’s like 8.8(405) to 9.7(116)

If you cut .020” off the deck(4cc) you end up with…….

9.2(405) and 10.1(116)

 

[Illahe]

I ran some numbers for an uncut block and a .040 gasket……..

It’s like 8.8(405) to 9.7(116)

If you cut .020” off the deck(4cc) you end up with…….

9.2(405) and 10.1(116)

I ran the 116’s in my 360 with EQ heads and it pulled fairly hard in the midrange with a SFT .550”@248/256.

 

[RIBOATSERVICES]

Yes. They oil through the head bolt bore to the rocker shaft like an OEM cylnder head.

Thank you, SM site lists push rod oiling.

 

[Illahe]

Thank you, SM site lists push rod oiling.

Not the ones I've run. Look at the Promaxx website. The head is likely made in the the same foundry (China). They're $1208 a pair without springs right now. I run Beehive springs with the SM heads.

Good luck!

 

[RustyRatRod]

I would imagine if the heads have rocker stands, they oil through the heads.

 

[GGress]

I would imagine if the heads have rocker stands, they oil through the heads.

Mine oil through the heads, but you should be able to pushrod oil with the right rockers.

 

[Dusterguy]

According to Charles Servedio the airgap intake flows only 220cfm (worst port). Does new high flowing heads help if intake flow only that? I dont know just thinking.

 

[69conv]

According to the SM website they offer 4 heads for small block mopar. 3 are oil thru pushrods, one is oil thru head. That one is sold as a bare head. pce281-1654"

 

[MidnightSwinger]

According to the SM website they offer 4 heads for small block mopar. 3 are oil thru pushrods, one is oil thru head. That one is sold as a bare head. pce281-1654"

Their website is written by Chinese bots. All the SM heads are oil through heads, and you can oil through pushrods if you need to(magnum). They are a direct copy of the Edelbrock performer LA head.

 

[69conv]

Mine oil through the heads,

@GGress Do you know which model you have?

 

[69conv]

All the SM heads are oil through heads

Can you take a picture?

 

[MidnightSwinger]

Can you take a picture?

Yeah, I have my 1 mo daughter sleeping on me right now lol I’ll get it later today.

 

[Illahe]

Yeah, I have my 1 mo daughter sleeping on me right now lol I’ll get it later today.

Congratulations. You’ve got your priorities straight.

 

[MidnightSwinger]

Congratulations. You’ve got your priorities straight.

Yes sir and thank you.

 

[MidnightSwinger]

@69conv Here you go

 

[GGress]

@GGress Do you know which model you have?

PCE821 2146

 

[TT5.9mag]

@69conv Here you go

View attachment 1716482102

View attachment 1716482104

Does your finger oil through the deck also?

 

[MidnightSwinger]

Does your finger oil through the deck also?

Usually, I charge extra, but for you anything!

 

[junkyardhero]

Usually, I charge extra, but for you anything!

a hat tip for you good sir, for the high road is rarely taken...

[the your mom joke was *right* there]

 

[Mopar Sam]

Their website is written by Chinese bots. All the SM heads are oil through heads, and you can oil through pushrods if you need to(magnum). They are a direct copy of the Edelbrock performer LA head.

This is 100 percent correct.

@GGress Do you know which model you have?

ALL Speedmaster Aluminum small block Mopar heads ARE OIL THROUGH!!!! No matter what their description is!!!

The iron magnum heads are not oil through.