Bob's Resource Website (2007) Studebaker headcasting numbers
(Sourced from newsgroup forums)
Bob's Resource Website (2007)
Studebaker headcasting numbers
|all 170 Six|
|all 51-54 V8|
59, 60, 61
|536790 (*1) (*2)|
|537571 (*1) (*2)|
|8.0:1/8.5:1||16G8, 6H, 56B, 56H
|8.0:1||(use 1542379), 59S|
|7.0:1||59S, 60S (Export)|
|( )||61S, 62S, 63S|
|1557570||1557571||63-64||Std|| 9.00:1 w/cupped pistons &|
Shim Head gasket(1545072) |
10.25:1 with flat top
pistons & shim gasket (1545072)
|54 cc||Standard R1 heads|
Truck & R2
| (*1) - 59-64 manual
(*2) - 55-56 manual
Casting# 1557582 are the R2 heads that have about 67 cc's and the Casting#
1557570 set is R 1 that has about 54 cc's. A 63 or 64 truck with either a
259 or 289 has the same casting number head as the R2.
With flat top pistons, the 67 cc (Casting 1557582) will give you about 9.0 compression and the 54 cc's ( Casting 1557570) about 10.25 or with dish 289 pistons about 7.5 and 8.5 respectively with the beaded steel head gaskets.
The 67 cc's ( Casting 1557582) came on some trucks also and the 54 cc's ( Casting 1557570) were on most of the '63, and '64 cars and a few of the '62's.
Casting 1537555 = 8.0 used on '55-'62 with composition head gasket and about 54.5 cc
Casting 1535976 = 7.5 used on '57 Golden Hawks with composition head gasket and some trucks and were about 56.5 cc
Casting 1557582 = 7.0 supposedly used on some trucks and are also the R 2 with 67.7cc
Casting 1555294 =7.75 used on '62 with the composition head gasket
Casting 1557581 = 8.0 and also used on '63 and '64 but with the composition gasket
The beaded steel gasket will give almost a half point higher compression
Ted Harbit (Oct 99)
On the cyl head center exhaust ports there is a raised number CAST in
the iron in between the head bolts. Not a stamped number.
It can be read without removing anything , except maybe dirt. It is not the part number you find in the books, but it is what most of us use to identify matching pairs of heads.
Except for the very uncommon R2 heads (582, which have big combustion chambers), the uncommon 1951 to 1954 232 heads (really tiny valves), and the super-rare tall-port R3 heads, ALL the rest (976, 570,555,etc) are pretty much the same- mid-50's cc's, same valves, etc. All the different compression ratios in the books were a function of stroke, and different piston dishes as much if not more than the small variances in head cc's.
The highest compression are the 537555 and 1557581 heads and were about 8.5 with the beaded steel head gaskets or about 8.0 with the composition. You can deduct between .4 and .5 for the composition gaskets compared to the beaded steel.
1557570 heads (used on most '63 and '64 and are R 1 heads) and 1555294 were about 8.25 with the beaded steel gasket. The 1557570 used with flat top pistons in the R 1 give 10.25 with the steel gasket.
535976 heads were about 8.0 with beaded steel gaskets. These were used on the Golden Hawks (among some other models) and with the composition gaskets were about 7.5.
1557582 heads were about 7.5 with beaded steel (These are R 2 heads that give 9.0 with flat top pistons).
The 537555 and 1557581 have about 54 cc chambers and the 1557582 heads had the most at 67.7 cc's.
These figures should be about right for all 259 engines and the 289's with dish pistons. And you can vary the compression on the 289 since you can get "cup" pistons that have about half the cc's as the dish pistons (or flat tops if preferred).
I think I have these right. Ted
David LeVesque (OCT99)
Casting # 1557570 is part # 1557571. It was used in most R1's. With the flat top pistons, and head gasket 1545072, it gave a 10.25 : 1 compression ratio. It was the "standard" R1 head in the sense that almost all R1's came with it. It was also used with dished pistons in other engines. Casting # 1557582 is part # 1557580. It is shown in the Dec. '63 Avanti parts book as the R2 head; and also "spec. order" on R1's. As used, R2 or R1, it gave a 9: 1 compression ratio. I've read it was used in lower compression trucks, too.
On some lists of head #'s, (John's, if 1557580 is a part #), the lower
compression, (9 : 1), R1 is listed as "standard".
I only have two different OHV head casting numbers in my files, there
may be more that I haven't found yet. The casting numbers are at the
rear of the head between two head bolts. One would have to remove the
valve cover to see them.